Year	Number
2001	5499000
2002	4989000
2003	4301000
2004	4612000
2005	4850000
2006	4171000
2007	5915000
2009	8365000
2010	8363000
2011	9521000
2012	8577000
2013	9438000
2014	11200000
2015	9308000